A 17-year-old girl in the U.K. named Jessika was a huge fan of Jessie J.

Sadly, Jessika had cancer Ewings Sarcoma, so she worked with the Make-A-Wish Foundation to arrange a meeting with Jessie!

Make-A-Wish said:

"We arranged for Jessika, who is from Norfolk, to visit London with her Aunt Tracey and best friend Georgie. They stayed in a top London hotel, and we provided them with some activity money to go off exploring. Jessika chose to take a shopping trip down Oxford Street, before being driven to the Roundhouse by limo."

Roundhouse is where Jessie J was going to be doing an event and show.

Jessika got VIP tickets so she could hang out back stage with other VIP celebs and then meet Jessie J herself!

The two Jesses got to hang out and Jessie signed one Jessika's clothes with "Just be true to who you are."

Those are lyrics from Jessika's favorite Jessie J song that helped her get through her cancer treatment.

We're so glad Jessie took the time to meet with a very special fan like this!